Welding Electrode Classification: AWS Codes, Coatings & Polarity Explained

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Welding electrode classification is a system used to identify important electrode characteristics such as tensile-strength class, welding-position capability, coating and current usability and, for certain electrode families, deposited weld-metal chemistry or additional performance requirements.

For common carbon-steel SMAW electrodes, classifications such as E6010, E6011, E6013, E7016 and E7018 allow welders, engineers and purchasing teams to distinguish electrodes by much more than product name. Understanding these codes helps prevent incorrect selection of strength class, welding position, power-source compatibility or coating type.

This guide focuses specifically on AWS welding electrode codes, coating types, welding positions and AC/DC polarity. If you first need a basic explanation of what an electrode does, see our What Is an Electrode in Welding? guide.

Key Takeaways

✓	AWS electrode classifications can indicate strength, welding position, coating and current usability.
✓	In a classification such as E7018, “70” represents the tensile-strength class and “1” indicates all-position usability.
✓	The final digit is associated with the electrode's coating and current-usability characteristics.
✓	Common coating families include cellulosic, rutile/high-titania and basic low-hydrogen coatings.
✓	E6010 and E6011 may have similar penetration characteristics, but their power-source usability differs significantly.
✓	Final electrode selection should always be verified against the base metal, WPS, applicable standard and manufacturer's datasheet.

What Does Welding Electrode Classification Mean?

A welding electrode classification is a standardized designation used to describe the properties and usability requirements that an electrode must meet. Instead of selecting a stick electrode only by trade name, engineers can use its classification to understand whether it belongs to the required strength class and whether its position, coating and electrical characteristics are suitable for the welding procedure.

Depending on the AWS specification and electrode family, classification requirements may address:

Tensile Strength	The minimum tensile-strength class required for the deposited weld metal.
Welding Position	Whether the classification is intended for all positions or restricted positions.
Coating & Usability	The covering type and associated arc, slag and operating characteristics.
Current / Polarity	Whether the electrode classification can be used with specified AC or DC conditions.
Weld-Metal Chemistry	Certain classifications include chemical-composition or alloy requirements.
Additional Requirements	Depending on classification, requirements may also involve impact properties, hydrogen designators or moisture-resistance designations.

AWS A5.1 vs AWS A5.5: Which Standard Applies?

Two AWS specifications are particularly important when discussing common carbon-steel and low-alloy-steel covered electrodes used for shielded metal arc welding.

AWS Standard	General Scope	Examples
AWS A5.1/A5.1M	Carbon steel covered electrodes for shielded metal arc welding.	E6010, E6011, E6013, E7016, E7018
AWS A5.5/A5.5M	Low-alloy steel covered electrodes for shielded metal arc welding.	E8018-C3, E9018-G and other low-alloy classifications

Minghua supplies carbon-steel and low-alloy covered electrodes including E6013 welding electrode,E7016 welding electrode,E7018 welding rod,E8018-C3 and E9018-G.

Is Electrode Type the Same as Electrode Classification?

No. The phrase electrode type may refer broadly to the welding process or electrode family, while an electrode classification refers to a standardized designation with defined requirements.

For example, SMAW covered electrodes, MIG wire electrodes, flux-cored electrodes and TIG tungsten electrodes are different electrode types. By contrast, E7018 is a specific classification for a covered SMAW electrode.

For the full process-, coating- and application-based breakdown, see our Types of Welding Electrodes guide.

How to Read an AWS Welding Electrode Code

A familiar example is E7018. Breaking the classification into sections makes the code easier to understand.

E	Electrode. The letter E identifies the consumable as an electrode.
70	Tensile-strength class. The “70” identifies a minimum tensile-strength class of 70 ksi.
1	Welding position. A third digit of “1” indicates an all-position classification.
8	Coating and current usability. The final digit forms part of the designation that defines the electrode's covering and permitted electrical operating characteristics.

Important:The quick interpretation above is useful for common carbon-steel covered-electrode classifications, but it is not a substitute for the complete AWS specification. Low-alloy, stainless-steel, nickel-alloy, cast-iron and hardfacing classifications use additional designation systems and requirements.

What Do Welding Position Digits Mean?

For common SMAW electrode classifications, the welding-position digit helps indicate where the electrode can be used under the classification requirements.

Position Digit	General Meaning	Example
1	All-position classification.	E6010, E6011, E6013, E7016, E7018
2	Generally used for flat groove welds and horizontal fillet welds within the applicable classification requirements.	Certain high-deposition electrode classifications

Always verify the specific manufacturer's operating instructions because an electrode product may have application recommendations that are narrower than the general classification capability.

Welding Electrode Coating Types Explained

The coating on a covered SMAW electrode is not simply a protective outer layer. Its formulation influences arc stability, penetration, shielding, slag behavior, deposition characteristics, hydrogen control and electrical usability.

1. Cellulosic Coatings

E6010 and E6011 are common examples associated with cellulosic electrode families. They produce a forceful, penetrating arc and fast-freezing weld characteristics that make them useful for applications such as root passes, field welding and repair.

One of the practical differences is electrical usability: E6010 is associated with DC operation, while E6011 is widely used where AC capability is required.

2. Rutile / High-Titania Coatings

Rutile or high-titania electrode formulations are associated with smooth arc characteristics, relatively easy slag removal and good operator appeal. A common example isE6013 welding electrode, which is widely used for general carbon-steel fabrication and repair applications.

3. Basic / Low-Hydrogen Coatings

Low-hydrogen covered electrodes are used where hydrogen control, weld integrity and mechanical performance are important. Common examples includeE7016andE7018.

E7018 is characteristically associated with a low-hydrogen iron-powder covering, while E7016 belongs to the low-hydrogen family without the same E7018 iron-powder classification. Their practical operating behavior and deposition characteristics therefore differ.

Storage Note:Low-hydrogen electrodes are moisture sensitive. Storage, atmospheric-exposure and rebaking requirements should be taken from the specific electrode manufacturer's technical data and the applicable welding procedure rather than using one universal temperature for every low-hydrogen electrode.

E6010 vs E6011 vs E6013 vs E7016 vs E7018 Classification Chart

The following chart provides a practical comparison of five common covered-electrode classifications. It should be used as a quick reference rather than a substitute for the manufacturer's technical datasheet.

AWS Classification	Coating Family	Position	Typical Electrical Usability*	Arc / Penetration	Typical Application
E6010	Cellulosic	All position	DC, commonly DCEP	Forceful / deep	Pipe roots, field welding
E6011	Cellulosic	All position	AC / DC*	Forceful / deep	Repair, maintenance, field work
E6013	Rutile / high titania	All-position classification	AC / DC*	Soft / moderate	General fabrication, sheet steel
E7016	Low hydrogen	All-position classification	AC / DCEP depending product	Controlled / medium	Structural and low-hydrogen welding
E7018	Low hydrogen / iron powder	All-position classification	DCEP; many products also support AC	Smooth / medium	Structural and heavy fabrication

*Exact current, polarity, amperage range and recommended welding positions depend on the specific manufacturer's formulation, electrode diameter and qualified welding procedure. Always verify the product datasheet before production welding.

Welding Electrode Polarity: AC, DCEP and DCEN

Polarity affects arc behavior, penetration and electrode performance. A classification must therefore be matched with a welding power source capable of providing the required current type and polarity.

AC	Alternating Current. Current direction alternates during welding. Some electrode classifications and product formulations are designed to operate effectively on AC.
DCEP / DC+	Direct Current Electrode Positive. The electrode is connected to the positive terminal. This is a common operating condition for many stick-electrode classifications.
DCEN / DC-	Direct Current Electrode Negative. The electrode is connected to the negative terminal. Only use DCEN where it is permitted for the selected electrode and procedure.

E6010 vs E6011: Why Polarity Matters

E6010 and E6011 are both commonly associated with penetrating cellulosic arcs, but their electrical usability is an important difference. E6010 requires a suitable DC power source, while E6011 is commonly selected when AC capability is needed.

This is why two electrodes with similar strength classes and welding-position digits cannot automatically be substituted for one another without checking the final usability digit, power source and WPS.

E7016 vs E7018 Classification

E7016 and E7018 are both widely used low-hydrogen electrode classifications in the 70 ksi tensile-strength class, but their covering formulations and operating characteristics are not identical.

Factor	E7016	E7018
Strength Class	70 ksi	70 ksi
Position Digit	1	1
Electrode Family	Low hydrogen	Low hydrogen / iron powder
Deposition Characteristics	Controlled deposition	Typically higher deposition potential
Typical Selection Context	Structural and low-hydrogen applications	Structural and production fabrication

For a more detailed comparison of applications, storage and buyer selection, read E7016 vs E7018 Welding Electrode. You can also view Minghua's E7016 electrode and E7018 welding rod.

What Do Suffixes Such as -C3 and -G Mean?

Low-alloy steel electrode classifications can include additional suffixes that identify requirements beyond the basic strength, position and usability digits. These designations are important because low-alloy electrodes may need to meet specific weld-metal chemistry, strength, toughness or application requirements.

Example	What the Basic Code Shows	Why the Suffix Matters
E8018-C3	80 ksi class, position digit 1, usability family 8	The C3 suffix identifies additional low-alloy classification requirements under the applicable AWS A5.5 specification.
E9018-G	90 ksi class, position digit 1, usability family 8	The G designation is used within the applicable specification for classifications that must satisfy defined requirements beyond the simple E90XX code.

Specification Note:Do not infer complete alloy chemistry or impact performance from a suffix alone. For project qualification, check the applicable AWS A5.5 requirements together with the electrode manufacturer's TDS, certificate and approved WPS.

How to Use Electrode Classification When Selecting a Welding Rod

Electrode classification is a selection tool, not a complete welding procedure. Use the classification in combination with the actual project requirements.

01	Identify the applicable specification. Determine whether the job calls for a carbon-steel, low-alloy or another electrode specification.
02	Match the required strength class. Select the classification according to the engineering and welding-procedure requirements rather than assuming the highest strength is always preferable.
03	Check the welding-position designation. Confirm that the classification and specific electrode product are suitable for the positions required by the job.
04	Verify current and polarity. Make sure the welding machine can provide the AC or DC conditions required for the selected electrode.
05	Review coating and hydrogen-control requirements. For critical steel structures, low-hydrogen classifications and correct storage practices may be essential.
06	Verify the WPS and manufacturer's datasheet. Classification alone does not define electrode diameter, amperage, preheat, interpass temperature or complete welding procedure.

If you need a broader application-based selection guide rather than detailed code interpretation, see Types of Welding Electrodes: Classification, Uses & Selection Guide.

Welding Electrode Classification FAQs

1. What does AWS electrode classification mean?

AWS electrode classifications provide standardized requirements for welding consumables. Depending on the specification, the designation may identify tensile-strength class, welding-position capability, coating and current usability, chemistry and other performance requirements.

2. What does E7018 mean?

In the common E7018 carbon-steel covered-electrode classification, “E” identifies an electrode, “70” indicates the 70 ksi tensile-strength class, “1” indicates all-position usability and the final “8” identifies the applicable coating/current-usability classification.

3. What does the third digit in a welding electrode number mean?

For common carbon-steel SMAW electrode classifications, the third digit identifies welding-position capability. A “1” indicates an all-position classification, while a “2” generally identifies more restricted position capability under the applicable classification.

4. What does the last digit in an electrode code mean?

The final digit is part of the designation used to define the electrode coating and electrical usability characteristics. It should not be interpreted separately from the applicable AWS classification table and the manufacturer's product data.

5. What is the difference between E6010 and E6011?

Both are cellulosic electrode classifications associated with penetrating arcs and all-position capability. A major practical difference is electrical usability: E6010 requires suitable DC operation, while E6011 can be used with AC-capable welding equipment under the appropriate operating conditions.

6. What is the difference between E7016 and E7018?

Both belong to the 70 ksi low-hydrogen electrode family and use the “1” position designation. E7018 is characteristically associated with an iron-powder low-hydrogen covering, giving it different deposition and operating characteristics from E7016.

7. What electrode coating types are commonly used?

Common covered-electrode families include cellulosic, rutile/high-titania and basic low-hydrogen coatings. Each family produces different arc, slag, penetration, hydrogen-control and power-source characteristics.

8. Can the same AWS electrode classification run on AC and DC?

Some classifications and commercial electrode formulations support both AC and suitable DC operation, while others have more restrictive electrical requirements. Always verify the classification, manufacturer's datasheet, polarity recommendation and WPS before welding.

Explore Minghua Welding Electrodes

Correct electrode selection starts with the required classification, but project buyers should also confirm electrode diameter, packaging, mechanical-property requirements, documentation and applicable WPS.

Browse the complete Minghua welding electrode range, compare mild steel and alloy steel welding sticks, or contact Minghua with your AWS classification, base-metal grade, electrode diameter, quantity and application requirements.